Broadcast application of lime or phosphogypsum to suppress aluminum (Al) in soils can influence chemistry and fate of phosphorus (P) in natural environments. However, the long-term effects of these amendments in organic P (P_o) forms and in soil biochemical properties remain unclear. This study assessed the effect of lime and phosphogypsum management on P_o contents, soil biochemical properties, and soybean (Glycine max L.) nutrition and yield. The long-term field experiment was carried out in highly weathered soil under no-till in southeastern Brazil. Soil chemical properties commonly used in soil fertility assessments were severely influenced by Al-suppressors broadcast over time. Changes in soil chemical attributes affected nutrient concentrations in soybean index leaves and grain yield, which was higher when lime was associated to phosphogypsum. The presence of Al-suppressors in the soil influenced the activity of enzymes linked to P and carbon (C) cycles, mainly in the 0–20 cm layer. The pH was mostly influenced by the activity of phosphatases, especially in the limed soil. Myo-inositol hexakisphosphate (IHP₆) was the second most abundant P form in the soil after orthophosphates, indicating crop litter P-inputs regulate the P_o cycle. Over time, soil management influenced the diversity and abundance of P_o forms measured by ³¹P nuclear magnetic resonance (NMR) spectroscopy compared to soil under native vegetation. Differences were most significant for the proportions of deoxyribonucleic acid (DNA), myo- and scyllo-inositol hexakisphosphates, and α- and β-glycerophosphates, which were higher in the soil under native vegetation.

广播应用石灰或磷石膏来抑制土壤中的铝 (Al) 会影响自然环境中磷 (P) 的化学性质和归宿。然而，这些改良剂对有机磷 (P _o ) 形式和土壤生化特性的长期影响仍不清楚。本研究评估了石灰和磷石膏管理对 P _o含量、土壤生化特性和大豆 ( Glycine maxL.) 营养和产量。长期田间试验是在巴西东南部的免耕高度风化土壤中进行的。土壤肥力评估中常用的土壤化学特性随着时间的推移受到铝抑制剂的严重影响。土壤化学属性的变化会影响大豆指数叶片中的养分浓度和谷物产量，当石灰与磷石膏相关时，这种变化会更高。土壤中铝抑制剂的存在影响了与 P 和碳 (C) 循环相关的酶的活性，主要是在 0-20 cm 层。pH 值主要受磷酸酶活性的影响，尤其是在石灰质土壤中。肌肌醇六KIS磷酸盐（IHP ₆) 是土壤中仅次于正磷酸盐的第二丰富的 P 形式，表明作物凋落物 P 输入调节 P _o循环。随着时间的推移，与原生植被下的土壤相比，土壤管理影响了³¹ P 核磁共振 (NMR) 光谱测量的 P _o形式的多样性和丰度。脱氧核糖核酸 (DNA)、肌醇和鲨肌醇六磷酸以及α-和β-甘油磷酸的比例差异最为显着，它们在原生植被下的土壤中较高。